柴油机电子调速器可靠性设计

文章阐述了柴油机电子调速器可靠性质量指标的重要性，提出了可靠性设计是提高电子调速器可靠性的基础，并具体地介绍了柴油机电子调速器的可靠性设计，采用裕度设计，降额设计，保护电路设计和耐振设计等技术措施，多年的实际应用证明，其可靠性是能够得到了分保证的。     

电铁串联电容补偿装置设置方案研究

以电气化铁道27.5 kv侧电压损失计算电路为基础,对电气化铁道串联电容补偿装置容抗的选择范围进行了分析,对串补装置安装置与最大提升网压的关系及其影响因素进行了研究,并对供电臂新设串补装置和新增串补装置的设置方案给出了建议.     

基于模糊时间Petri网的列车运行时间不确定性问题的处理

定义一种应用于铁路列车运行系统的模糊时间Petri网；针对列车运行时间存在的不确定性，该Petri网引入了4个模糊集理论函数：模糊时间片、模糊使能时间、模糊发生时间和模糊延迟，来处理时间的不确定性问题；能够对列车运行过程中的时间不确定性问题进行定量分析，可以有效应用于列车交会、列车终到时间、列车运行计划调整的分析等；其相对于已有的方法具有精确分析、计算简单、简化系统、便于系统集成的特点。     

Evaluation of a cellular phone-based system for measurements of traffic speeds and travel times: A case study from Israel

The purpose of this paper is to examine the performance of a new operational system for measuring traffic speeds and travel times which is based on information from a cellular phone service provider. Cellular measurements are compared with those obtained by dual magnetic loop detectors. The comparison uses data for a busy 14 km freeway with 10 interchanges, in both directions, during January–March of 2005. The dataset contains 1 284 587 valid loop detector speed measurements and 440 331 valid measurements from the cellular system, each measurement referring to a 5 min interval. During one week in this period, 25 floating car measurements were conducted as additional comparison observations. The analyses include visual, graphical, and statistical techniques; focusing in particular on comparisons of speed patterns in the time–space domain. The main finding is that there is a good match between the two measurement methods, indicating that the cellular phone-based system can be useful for various practical applications such as advanced traveler information systems and evaluating system performance for modeling and planning.     

双线铁路下承式连续梁拱组合桥列车一桥梁时变系统空间振动随机分析

在列车一桥梁时变系统横向振动能量随机分析理论的基础上，采用26个自由度的列车空间振动模型，以空间梁单元模拟桥梁结构，以普通空间梁元即12自由度的空间梁元来模拟拱及吊杆结构，建立了双线铁路下承式连续梁拱组合式桥列车一桥梁时变系统空间振动分析模型，分别以构架人工蛇行波及前苏联规律性的竖向不平顺函数为横向及竖向激振源，进行双线铁路下承式连续梁拱组合式桥列车一桥梁时变系统空间振动响应分析。计算了列车以不同车速通过桥梁的空间振动响应，所得结果可供设计参考。     

城市轨道交通行车间隔时间优化模型研究

运营组织是轨道交通运营企业工作的核心部分,直接影响到企业的服务质量和经济效益。行车间隔时间是运营组织的主要参数。提出了以乘客满意度和企业满意度加权平均值最大为总体目标的行车间隔时间优化模型,并在一条具体的实例线路上演示了计算和分析的过程。本研究思路借鉴了城市公共交通运营管理优化的研究方法和部分理论,对于城市轨道交通的运营组织优化研究进行了尝试。     

广州地铁1、2号线常见故障处理准备工作

地铁的高密度行车,使任何故障都有可能造成列车阻塞,对运营服务产生较大影响.为了尽量缩减阻塞时间,根据地铁运营中的常见故障,总结出一些故障处理的准备工作,主要有URM监控员、勾锁器、列车引导员、备用车、小交路运营等的准备.旨在更加高效地完成故障处理,进一步减少故障给地铁运营造成的影响.     

Urban form,travel time,and cost relationships with tour complexity and mode choice

The primary purpose of this study was to investigate how relative associations between travel time, costs, and land use patterns where people live and work impact modal choice and trip chaining patterns in the Central Puget Sound (Seattle) region. By using a tour-based modeling framework and highly detailed land use and travel data, this study attempts to add detail on the specific land use changes necessary to address different types of travel, and to develop a comparative framework by which the relative impact of travel time and urban form changes can be assessed. A discrete choice modeling framework adjusted for demographic factors and assessed the relative effect of travel time, costs, and urban form on mode choice and trip chaining characteristics for the three tour types. The tour based modeling approach increased the ability to understand the relative contribution of urban form, time, and costs in explaining mode choice and tour complexity for home and work related travel. Urban form at residential and employment locations, and travel time and cost were significant predictors of travel choice. Travel time was the strongest predictor of mode choice while urban form the strongest predictor of the number of stops within a tour. Results show that reductions in highway travel time are associated with less transit use and walking. Land use patterns where respondents work predicted mode choice for mid day and journey to work travel.

交叉口行人过街心理及交通行为分析

行人与机动车的冲突是影响交叉口运行效率的重要因素。研究交叉口行人过街心理及行为的意义,分析行人过街过程及心理特征,总结行人过街等待时间、穿行速度特征、可接受间隙、违章行为及道路交通环境对行人心理和行为的影响,对行人的违章心理进行论述,并提出减少行人违章的措施。     

Passengers’ willingness to pay for airport ground access time savings

There are cases when passengers are willing to pay a premium to reduce the travel time, in particular when the trip has to be made. This paper aims to provide insight into factors that determine passengers’ willingness to pay to reduce travel time for their ground access to an airport. A methodology is developed that comprises two steps: the identification of the passengers with zero willingness to pay and from the rest the estimation of the additional price they are willing to pay to reduce their travel time. For the first step a Probit model was formulated and for the second a linear regression model. To this purpose, data has been collected employing stated preference from passengers at the Athens International Airport. It has been found that a high percentage of passengers have zero willingness to pay, and of the remaining ones those using public transport have a significant willingness to pay to reduce access travel time. The methodology and the models are structured in such a way that their transferability to any airport environment is possible, thus providing a useful tool for decisions relating to airport ground access measures.